Having had an opportunity to test Onkyo TX-RZ710 vs Onkyo TX-SR373, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 7.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the TX-RZ710 has such a ratio W/Ohm - 175/6 1KHz, while the TX-SR373 has a power of 135/6 1KHz. The value of total harmonic distortion is also different, and for the TX-RZ710 it is 0.08%, but for the TX-SR373 it is 0.06%.
The manufacturer installed different DACs, the TX-RZ710 received the model AK4458 384 KHz/32-bit, but the TX-SR373 is equipped with 192 KHz/24-bit. The Bi-amping function is implemented only in the Onkyo TX-RZ710. The model TX-RZ710 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. The TX-RZ710 has access to the Spotify service.
Support for the HDR function can only boast of each of the AV receivers. The quality of 4K 60p signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the TX-RZ710 and the TX-SR373. Video scaling is only possible with the TX-RZ710. Review participants do not have the Dolby Vision feature.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-RZ710 has 8/2, and the TX-SR373 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-RZ710 and the TX-SR373. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-RZ710 and TX-SR373 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-RZ710. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in TX-RZ710. None of these units can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-RZ710. Only in the TX-RZ710 realized a DTS:X surround technology.
The Onkyo TX-RZ710 is better receiver in this comparison. Check Onkyo TX-RZ710 price